Quinquagenarian : পঞ্চাশ হইতে ঊনষাট বৎসর বয়স্ক;
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Appropriate Prepositions
Apology for (কোনো কারনে ক্ষমা চাওয়া): Sajib should ask apology to her of his mistake.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Contribution to (অবদান): His invention made a major contribution to road safety.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
On the wane (হ্রাসমান): His fame is on the wane now.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.